THE HRC box you speak of (part #30490-NKD-840) is to further advance the timing, it's supposed to be used with the HRC loom and has to be spliced into the normal '21 road loom, Monkey's is done and works fine, I've never seen any documentation on how it should be done, I'd work out how it was before and take it out for now at least.

And be very careful randomly grounding wires out and guessing connections, PGMs do melt quite easily.
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